Don-
On my heating system there are two hoses coming out of the furnace. The small one, about 2-1/2" in diameter is directed into the underbelly for heating the tanks and water system. The other, about 4" in diameter is tied into the main floor duct that runs the length of the trailer and the connection was made next to the bedroom outlet, therefore the majority of the air flow would exit in the first outlet until I installed the adjustable vent to pinch it off and force the air towards the opposite end of the trailer.
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